Patent US4381340A successfully refreshed from Google Patents.
US4381340A
Expired / Lapsed
US
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Method of treating lithographic printing plates with 2-propoxyethanol
Assignee: CNA Holdings LLC
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Filing: 1981-08-31
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Granted: 1983-04-26
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Expires: 2001-08-31
Abstract
Abstract A developer suitable for machine and hand processing may now be made which accomplishes the aforementioned objects which is an aqueous solution comprising 2-propoxyethanol as a detackifying agent, an adjuvant solvent, a nonionic surfactant with a hydrophile-lipophile balance over about 17, and an inorganic salt. A developer/finisher may be prepared by adding thereto a water-soluble polymeric film former which is preferably polyvinyl pyrrolidone. A suspending agent, e.g. polyethylene glycol, is added to hand processing solutions.
Inventors
- 👤 John E. Walls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:52
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
35 words
The method of developing a lithographic printing plate having resin binders in photosensitive coatings adherent thereupon, comprising treating said printing plate with a solution comprising 2-propoxyethanol as a detackifying agent, to remove the nonimage portions.
Claim 2
Independent Claim
35 words
The method of developing a lithographic printing plate having resin binders in photosensitive coatings adherent thereupon, comprising treating said printing plate with a solution comprising 2-propoxyethanol as a detackifying agent, to remove the nonimage portions.
Claim 3
Dependent Claim
32 words
The method of claim 1, wherein said solution comprises (a) 2-propoxyethanol as a detackifying agent, (b) a nonionic surfactant having an hydrophile-lipophile balance greater than about 17; and (c) an inorganic salt.
Claim 4
Dependent Claim
14 words
The method of claim 2, wherein said solution further comprises an adjuvant organic solvent.
Claim 5
Dependent Claim
21 words
The method of claim 3, wherein said adjuvant organic solvent has a vapor pressure greater than about 1 mm of mercury.
Claim 6
Dependent Claim
23 words
The method of claim 4, wherein the adjuvant organic solvent is selected from the class consisting of n-propanol, isopropanol, and propoxy isopropropyl ether.
Claim 7
Dependent Claim
22 words
The method of claim 4, wherein the solution further comprises a polyethylene glycol having an average molecular weight not exceeding about 800.
Claim 8
Independent Claim
55 words
A method for simultaneously developing and finishing a lithographic printing plate having resin binders in photosensitive coatings adherent thereupon, comprising treating said printing plate with an aqueous solution comprising a detackifying agent comprising 2-propoxyethanol to remove the nonimage protion and impart oleophilicity to the image and hydrophilicity to the nonimage portions of said printing plate.
Claim 9
Independent Claim
55 words
A method for simultaneously developing and finishing a lithographic printing plate having resin binders in photosensitive coatings adherent thereupon, comprising treating said printing plate with an aqueous solution comprising a detackifying agent comprising 2-propoxyethanol to remove the nonimage protion and impart oleophilicity to the image and hydrophilicity to the nonimage portions of said printing plate.
Claim 10
Dependent Claim
39 words
The method of claim 7, wherein said solution comprises (a) 2-propoxyethanol as a detackifying agent, (b) a nonionic surfactant having an hydrophile-lipophile balance greater than about 17, (c) an inorganic salt; and (d) a water soluble polymeric film former.
Claim 11
Dependent Claim
14 words
The method of claim 8, wherein said solution further comprises an adjuvant organic solvent.
Claim 12
Dependent Claim
22 words
The method of claim 9, wherein the adjuvant solvent is selected from the class consisting of n-propanol, isopropanol, and propoxy isopropyl ether.
Claim 13
Dependent Claim
26 words
The method of claim 8, wherein said water soluble polymeric film former is a polyvinyl pyrrolidone having a molecular wieght between about 5,000 and about 100,000.
Claim 14
Dependent Claim
21 words
The method of claim 8, wherein said solution further comprises polyethylene glycol having an average molecular weight not exceeding about 800.
References Cited (Backward Citations)
US3745028A
Cited
US4186006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |